From: 7stud -- <lists@...>
Date: 2012-09-17T13:25:55+09:00
Subject: Re: Breaking Down the Block

z = y.select {|a, b| b == y[0][1]}
p z

--output:--
[[30, 2]]

In this example the conditional b == y[0][1] is equivalent to b == 2. 
If instead you had results like this,

[[10, 3], [30, 3], [20, 1], [40, 1]]

...then the conditional would be b == 3, which just selects all the 
numbers that tie for the most appearances in the original array.


z = z.map {|a, b| a}
p z

--output:--
[30]

map just selects the first element of all the sub arrays, which are the 
numbers that appear the most times in the original array.

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